B-51Q is Over the Head Dual Earmuff heavy duty noise cancelling headphones with Adjustable Metal Boom Arm that deliver superior voice with noise cancellation, while providing comfort and stability.

RAN-3000CF is a Dual-Muff, over-the-head Carbon Fiber headset with noise cancelling swivel Flexible boom microphone.Includes 3.5mm Audio Input port,Electret or Dynamic microphone is available,deliver enhanced noise reduction, superior voice with noise cancellation, while providing comfort and stability.